Edwards Polaris™ class 57 series LED beacons are NEMA type 4X and IP66-rated visual signals suitable for use in indoor and outdoor applications. The units are field configurable with seven flash patterns, including steady-on, utilizing a "hidden in plain sight" (HIPS) switch. The inner, double fresnel lens is made of a high grade polycarbonate and is designed to magnify the ultra-bright LED's inside. A clear, outer, impact-resistant polycarbonate dome offers additional protection against accidental impacts with machinery or falling objects. It also acts as a protective and simple to clean "dust and residue" cover. The 57 series beacons are designed to be mounted on 3/4 in NPT conduit (indoor or outdoor). To maintain the NEMA and IP ratings for outdoor installation, the beacon must be mounted with the dome facing directly up. When installing the beacon indoors in dry environments, it can be mounted in any position. The 57 series is designed for industrial or commercial applications that require the longevity of an LED combined with the brightness of a xenon strobe. These units are very effective in high noise areas where ear protection is worn or audible signals may not be heard.